The evaluation of the dynamic behavior of a rotating system is possible by means of modal parameters (Eigenvalues and Eigenvectors). A mixed analytical and experimetal approach is used to identify the modal parameters of a specially designed test rig. The modal identification is done both for nonrotating as well as rotating systems. These modal parameters are used to validate a developed Finite Element Model.

Topics: NASA Technical Reports Server (NTRS), ELASTIC PROPERTIES, FINITE ELEMENT METHOD, MOUNTING, ROTARY...

An analytical method is being developed to determine the signature of an acoustic emission waveform from a growing crack and the results of this analysis are compared to experimentally obtained values. Within the assumptions of linear elastic fracture mechanics, a two dimensional model is developed to examine a semi-infinite crack that, after propagating with a constant velocity, suddenly stops. The analytical model employs an integral equation method for the analysis of problems of dynamic...

Topics: NASA Technical Reports Server (NTRS), ACOUSTIC EMISSION, CRACK PROPAGATION, ELASTIC PROPERTIES,...

The potential of using an interface layer to reduce thermal stresses in the matrix of composites with a mismatch in coefficients of thermal expansion of fiber and matrix was investigated. It was found that compliant layers, with properties of readily available materials, do not have the potential to reduce thermal stresses significantly. However, interface layers with high coefficient of thermal expansion can compensate for the mismatch and reduce thermal stresses in the matrix significantly.

Topics: NASA Technical Reports Server (NTRS), FIBER COMPOSITES, FIBER-MATRIX INTERFACES, FIBERS,...

An asymptotic theory is presented to analyze perturbations of bifurcations of the solutions of nonlinear problems. The perturbations may result from imperfections, impurities or other inhomogeneities in the corresponding physical problem. It is shown that for a wide class of problems the perturbations are singular. The method of matched asymptotic expansions is used to obtain asymptotic expansions of the solutions. Global representations of the solutions of the perturbed problem are obtained...

Topics: DTIC Archive, Matkowsky,Bernard J, Reiss,Edward L, NEW YORK UNIV N Y COURANT INST OF MATHEMATICAL...

A procedure for residual strength analysis of complex structure has been outlined and tested in predicting failure stresses for several complex, riveted, bolted and adhesively bonded structural panels. This new method makes use of the material crack growth resistance curve incorporating both elasto- plastic and slow stable tear in the fracture criterion for skin critical structure. Comparisons were made with assumed Dugdale, Prandtl-Reuss, and elastic material behavior for both skin and...

Topics: DTIC Archive, Ratwani, M. M., NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV, *STRENGTH(MECHANICS),...

This work assesses the influence of an initial stress field on the non-linear, elastic-plastic response of a submerged isotropic cylindrical shell to transient acoustic loading. Whereas analytical solutions have been obtained for the linear response of such shells to simple temporal and spatial loadings, numerical solutions must be used for the more general case. The Doubly Asymptotic Approximation (DAA) when used in conjunction with the finite element method has been shown to good results for...

Topics: DTIC Archive, Giltrud,Michael E, NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD, *STRESSES,...

The elastic constants C(11), C(33), C(44), C(13) of oriented poly(propylene) films are measured with Brillouin scattering and are compared with the elastic constants obtained from extruded poly(propylene) rods. The photoelastic constants P(12), P(13) and (P31) of the extruded rod samples are measured by comparison to a poly(methylmethacrylate) reference scatterer. In the film samples, the relative values of the photoelastic constants P(11), P(33), P(13) and P(31) are measured by comparison of...

Topics: DTIC Archive, Cavanaugh,David B, UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY, *DEFORMATION, *FILMS,...

This report describes the development of a three-dimensional elastic- viscoplastic work-hardening constitutive relationship for earth materials. The constitutive relationship is capable of reproducing the hysteretic behavior of the material under both hydrostatic and deviatoric states of stress; it also accounts for shear-induced volume change and the effect of superimposed hydrostatic stress on shearing response. The capability of the constitutive relationship for simulating the time-dependent...

Topics: DTIC Archive, Baladi, George Y., ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...

An efficient grid based Langevin formulation is developed for treating electron electron (e-e) and electron ion collisions within a particle in cell plasma simulation code. The formulation is energy and momentum conserving, and is quantitatively accurate for all parts of the energy distribution. This is particularly important in calculating the approach to equilibrium of the high-energy tail, or the equilibrium under the competing influences of e-e collisions, inelastic electron neutral...

Topics: DTIC Archive, Manheimer, Wallace M., NAVAL RESEARCH LAB WASHINGTON DC INTENSE PARTIAL BEAMS AND...

The report discusses the general types of failures of typical structures that are used in aircraft and missiles. The theories of elastic and plastic deformation of these structures are presented and comparison with experiments of simple structures is given. It is found that the side on impulse can be used together with rigid-plastic theory of buckled and collapsed cylinders to predict plastic deformation for a wide range of pulse durations. For beam type structures the impulse and rigid plastic...

Topics: DTIC Archive, Greenspon, Joshua E, J G ENGINEERING RESEARCH ASSOCIATES BALTIMORE MD, *BLAST,...

The report presents a method for determining shear modulus and shear strength of unidirectional fiber-reinforced composites. The method incorporates data from uniaxial tensile and/or compressive tests at fiber orientations of 0, 45, and 90 degrees. The approach presented requires fewer specimens for shear strength determinations than current existing procedures.

Topics: DTIC Archive, Tsai, Stephen W, AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH, *COMPOSITE...

In recent years mechanistic models have been advocated as a tool for predicting the performance of pavement systems under aircraft traffic. In the investigation reported herein, layered elastic and nonlinear finite element models were used to determine the benefit of stabilized layers within a pavement system. The performance of several types of pavement structures that were constructed and trafficked under controlled conditions at the US Army Engineer Waterways Experiment Station were analyzed...

Topics: DTIC Archive, Barker, W R, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS, *RUNWAYS,...

Internal stress in and around an oblate spheroidal inclusion is evaluated by using Eshelby theory. We consider three different sources of internal stress as a function of the aspect ratio and elastic moduli ratio; these are (1) misfit effect (2) inhomogeneity effect and (3) plastic deformation effect. The misfit effect arises from the difference of thermal expansion coefficients of the matrix and inclusion. Normal stresses within the inclusion (or the principal stresses), maximum shear stress...

Topics: DTIC Archive, Shibata,M, CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE,...

This investigation is concerned with the deformations and stresses in a slab of all-around infinite extent containing a traction-free plane crack, under conditions of plane strain. The analysis is carried out within the framework of the fully nonlinear equilibrium theory of homogeneous and isotropic incompressible elastic solids. For a fairly wide class of such materials and general loading conditions at infinity, asymptotic estimates appropriate to the various field quantities near the...

Topics: DTIC Archive, Stephenson,Rodney A, CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED...

Recent applications of laminated composites to ship structural components have highlighted both the analytical complexities involved and the need for providing the structural designer and analyst with appropriate laminate analysis methods. To this end, three types of analytical methods, traditionalloy applied to metallic ship structural components, have been extended to the analysis of laminated composites; procedures for their implementation are discussed. These methods include: (a)...

Topics: DTIC Archive, Critchfield,Milton O, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...

The present report is a continuation and conclusion of two previous OSU-DGSS reports (AD-A108 999 and AD-A099 015). It treats the solution of Sasao, Okubo and Saito (1980), which is the simplest and most straight forward solution of Molodensky's liquid core problem (Part A). In Part B, a relatively little known variational principle of Poincare is derived and applied to a unified deduction of the equations of Sasao et al. Part C provides explicit expression for lunisolar nutation and polar...

Topics: DTIC Archive, Moritz,Helmut, OHIO STATE UNIV COLUMBUS DEPT OF GEODETIC SCIENCE AND SURVEYING,...

In this paper a nonhomogeneous elastic medium containing a crack arbitrarily oriented with respect to the direction of property gradient is considered. The problem is solved under plane strain or generalized plane stress conditions. This is a highly simplified version of a class of physical problems that may arise in fracture mechanics studies of ceramic coatings, metal/ceramic composites and interfacial zones with continuously varying volume fractions or graded properties. The main results of...

Topics: DTIC Archive, Konda, Noboru, LEHIGH UNIV BETHLEHEM PA, *CRACKING(FRACTURING), *CERAMIC COATINGS,...

Two different types of simulations are required for analyzing Army vehicles when they are subjected to explosive/impact loads: (a) Survivability analysis, when loads generate damage on the vehicle structure by causing permanent deformation; (b) Shock analysis, when the vehicle structure remains within the elastic region. Shock analysis ensures that vibration levels must remain low at locations where electronic equipment is mounted. Due to short duration of the load the high frequency response...

Topics: DTIC Archive, MICHIGAN UNIV ANN ARBOR, *MILITARY VEHICLES, *FINITE ELEMENT ANALYSIS, *SHOCK, *ARMY...

It is shown that in a rearrangement collision leading to the formation of the highly excited hydrogenlike states the cross section in all orders of the Born approximation behaves as 1/n sq, with n the principal quantum number, thus invalidating the Brinkman-Kramers approximation for large n. Similarly, in high energy inelastic electron-hydrogenlike atom collisions the exchange cross section for sufficiently large n dominates the direct excitation cross section.

Topics: NASA Technical Reports Server (NTRS), ASYMPTOTIC METHODS, COULOMB COLLISIONS, HYDROGEN...

A small strain theory, three-dimensional elastic-plastic finite element analysis was used to simulate fracture in thin sheet 2024-T3 aluminum alloy in the T-L orientation. Both straight and tunneled cracks were modeled. The tunneled crack front shapes as a function of applied stress were obtained from the fracture surface of tested specimens. The stable crack growth behavior was measured at the specimen surface as a function of applied stress. The fracture simulation modeled the crack tunneling...

Topics: NASA Technical Reports Server (NTRS), ALUMINUM ALLOYS, CRACK PROPAGATION, CRACK TIPS, FINITE...

A noncontacting, two-dimensional (2-D) laser inspection system has been designed and implemented to dimensionally profile thermal barriers being developed for space vehicle applications. In a vehicle as-installed state, thermal barriers are commonly compressed between load sensitive thermal protection system (TPS) panels to prevent hot gas ingestion through the panel interface during flight. Loads required to compress the thermal barriers are functions of their construction, as well as their...

Topics: NASA Technical Reports Server (NTRS), THERMAL PROTECTION, EXPERIMENT DESIGN, LASERS, HIGH...

The multilayer theory of anisotropic elasticity and a finite element method were used to analyze the open-mode delamination stress concentrations in horseshoe and elliptic laminated composite curved bars. Two types of laminations, solid laminations and sandwich laminations, were analyzed. It was found that the open-mode delamination stress concentration could be greatly increased in these two types of curved bars by decreasing their aspect ratios. The open-mode delamination stress concentration...

Topics: NASA Technical Reports Server (NTRS), BARS, DELAMINATING, FINITE ELEMENT METHOD, SANDWICH...

This survey paper describes recent developments in the area of parametrized variational principles (PVP's) and selected applications to finite-element computational mechanics. A PVP is a variational principle containing free parameters that have no effect on the Euler-Lagrange equations. The theory of single-field PVP's based on gauge functions (also known as null Lagrangians) is a subset of the inverse problem of variational calculus that has limited value. On the other hand, multifield PVP's...

Topics: NASA Technical Reports Server (NTRS), EULER-LAGRANGE EQUATION, FINITE ELEMENT METHOD, SURVEYS,...

Yield stresses, allowable stresses, moment capacities (plastic moments), external loadings, manufacturing errors,... are not given fixed quantities in practice, but have to be modelled as random variables with a certain joint probability distribution. Hence, problems from limit (collapse) load analysis or plastic analysis and from plastic and elastic design of structures are treated in the framework of stochastic optimization. Using especially reliability-oriented optimization methods, the...

Topics: DTIC Archive, Marti, K., UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY F R), *STRESS...

A unique set of experiments has been conducted to study the response of three FCC alloys to abrupt changes of loading direction at finite strain using large strain compression and torsion experiments, as well as sequences of the two. Evolution of grain morphology, substructure and texture have been experimentally quantified. It was observed that in spite of differences in dislocation substructures and mechanisms of inelastic deformation, the nonproportional straining response of the two alloys...

Topics: DTIC Archive, McDowell, David L., GEORGIA TECH RESEARCH CORP ATLANTA, *STAINLESS STEEL,...

A method is presented for predicting the fatigue life of notched members from smooth specimen fatigue data. Inelastic behavior of the material at the notch root is treated using Neuber's rule which states that the theoretical stress concentration factor is equal to the geometric mean of the actual stress and strain concentration factors. This provides indices of equal fatigue damage for notched and unnotched members. Experimental results for notched aluminum alloy plates subjected to one or two...

Topics: DTIC Archive, Topper, T H, ILLINOIS UNIV AT URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS,...

Historical study that explains the underlying principles of computing the deflections of trusses. Also discusses the fundamental principles of truss computation and the theoretical basis of the method of elastic weights.

Topics: DTIC Archive, Niles, A. S., Jr., AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH WRIGHT RESEARCH...

Considering a locking material prior to compaction as a special case of a nonlinearly hardening elastic material, conditions at a discontinuity--a locking front-are analyzed on the basis of three dimensional theory. This study leads to the important result that the major compressive principal stress at a locking front must always be normal to the front, even if the front is not plane. Based on this general result, the effect of a uniform step pressure traveling with subseismic velocity on the...

Topics: DTIC Archive, WEIDLINGER ASSOCIATES NEW YORK, *ELASTIC PROPERTIES, *MECHANICAL WAVES, *AIRBURST,...

Part I presents Influence Diagrams for Stresses and Deflections in Two-Layer Pavement Systems for Airfields, which are intended to provide the essential background and bases for understanding the character and effectiveness of layered system reinforcing action. Influence diagrams of vertical stresses and shear stresses at intervals of depth in layered systems and deflections at the surface are presented covering suitable ranges of the basic two-layer system parameters. The significance of these...

Topics: DTIC Archive, COLUMBIA UNIV NEW YORK DEPT OF CIVIL ENGINEERING AND ENGINEERING MECHANICS, *ASPHALT,...

Hydroelasticity is the phenomenon involving interactions among inertial, hydrodynamic and elastic forces. When all three of the phenomena are involved simultaneously, the resulting action is said to be dynamic; when only two of the three phenomena are involved simultaneously, the result is defined as static. The existence of hydroelasticity is confined to the mutual interactions of two or three of the above phenomena.

Topics: DTIC Archive, EVANS, GEORGE R, LOCKHEED MISSILES AND SPACE CO INC SUNNYVALE CA, *BIBLIOGRAPHIES,...

A study was made of one-dimensional wave propagation in and above the elastic range in rods of 24T4 aluminum, 1018 steel, and copper. Theory was developed describing the waves as consisting of a front of decreasing steepness followed by a zone of inelastic slip. Strain gage measurements were used to verify the theory.

Topics: DTIC Archive, Bailey, Neil P., UTAH UNIV SALT LAKE CITY HIGH VELOCITYLAB, *METALS, *ALUMINUM...

It is the purpose of this paper to review the recent history of the development of pyrolytic graphite and its thermal, aerothermochemical, and structural properties with regard to its application to hypersonic vehicles. Pyrolytic graphite is not really new since its discovery dates back to Thomas Edison, however, this class of refractory materials has been rediscovered recently because it possesses certain desirable properties at extremely high operating temperatures, including a high strength...

Topics: DTIC Archive, Garber, A M, GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV, *PYROLYTIC...

A nonlinear boundary value problem was considered for the axisymmetric buckling of thin spherical shells subjected to uniform external pressure. The uniformly compressed spherical state is a solution of this problem for all values of the pressure. It was proven, using Poincare's method, that for pressures sufficiently near each simple eigenvalue of the linearized shell buckling theory, there is another (buckled) solution of the nonlinear problem. A convergent perturbation expansion was used to...

Topics: DTIC Archive, NEW YORK UNIV NY COURANT INST OF MATHEMATICAL SCIENCES, *BOUNDARY VALUE PROBLEMS,...

A new measure of intrinsic time is introduced which broadens the endochronic theory and lends it a wider predictive scope. Idealized plastic models are shown to be constitutive subsets of the general theory and the phenomenon of yield is proved to be a consequence of a particular definition of the intrinsic time measure in terms of the plastic strain tensor. Various versions of the classical plasticity theory are shown to be asymptotic cases of the endochronic theory. In particular the...

Topics: DTIC Archive, Valanis, K. C., IOWA UNIV IOWA CITY, *PLASTIC PROPERTIES, KINEMATICS, STRESS STRAIN...

A uniaxial, uncoupled constitutive model to predict the response of thermal and rate dependent elastic-plastic material behavior is presented. The model is based on an incremental classicial plasticity theory extended to account for thermal, creep, and transient temperature conditions. Revisions to he combined hardening rule of the theory allow for better representation of cyclic phenomenon including the high rate of strain hardening upon cyclic reyield and cyclic saturation. An alternative...

Topics: NASA Technical Reports Server (NTRS), ELASTIC PROPERTIES, HIGH TEMPERATURE, HYSTERESIS, LOADING...

Sealing interface materials and coatings are sacrificial, giving up their integrity for the benefit of the component. Seals that are compliant while still controlling leakage, dynamics, and coolant flows are sought to enhance turbomachine performance. Herein we investigate the leaf-seal configuration. While the leaf seal is classified as contacting, a ready modification using the leaf-housing arrangement in conjunction with an interface film rider (a bore seal, for example) provides for a...

Topics: NASA Technical Reports Server (NTRS), SEALING, DESIGN ANALYSIS, ELASTIC PROPERTIES, COMPUTATIONAL...

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Simulated flight tests of elastic swept-wing bomber and fighter model coupled wing tip to wing tip

Topics: BOMBER AIRCRAFT, BOMBER AIRCRAFT, ELASTICITY, FIGHTER AIRCRAFT, FLIGHT TEST, SIMULATION, SWEPT...

The room temperature mechanical properties of SiC fiber reinforced reaction-bonded silicon nitride matrix composite laminates (SiC/RBSN) have been measured. The laminates contained approx 30 volume fraction of aligned 142-micron diameter SiC fiber in a porous RBSN matrix. Three types of laminate studied were unidirectional: (1) (0) sub 8, (2) (10) sub 8, and (3) (45) sub 8, and (90) sub 8; cross plied laminates (0 sub 2/90 sub 2); and angle plied laminates: (+45 sub 2/-45 sub 2). Each laminate...

Topics: NASA Technical Reports Server (NTRS), CERAMIC MATRIX COMPOSITES, FIBER COMPOSITES, LAMINATES,...

A system which rapidly determines the elastic stiffness constants of materials in plate shape as well as characterize material flaws that are affecting these constants. Rapid (below a minute) nondestructive evaluation system allow for the determination of material stiffness constants, low noise data acquisition algorithm for measuring spectral data. A real time method of displaying leaky Lamb wave spectral data.

Topics: NASA Technical Reports Server (NTRS), DEFECTS, ELASTIC PROPERTIES, SHAPES, STIFFNESS, ULTRASONICS,...

An empirical study was conducted to characterize the multiaxial, thermomechanical responses of new high temperature NiTiHf alloys. The experimentation included loading thin walled tube Ni(sub 50.3)Ti(sub 29.7)Hf(sub 20) alloy samples along both proportional and nonproportional axial-torsion paths at different temperatures while measuring surface strains using stereo digital image correlation. A Ni(sub 50.3)Ti(sub 33.7)Hf(sub 16) alloy was also studied in tension and compression to document the...

Topics: NASA Technical Reports Server (NTRS), NICKEL ALLOYS, TITANIUM ALLOYS, HAFNIUM ALLOYS, SHAPE MEMORY...

The object of this program was to determine the feasibility of autofrettaging cannon barrels with explosives. The study involved determining the applicability of, the reliability of, and the scaling laws associated with the process. The results of this study provide the basis for the establishment of specifications and procedures for the explosive autofrettage of 152 mm gun barrels. The study consisted of mutually supportive experimental and analytical programs conducted concurrently. An...

Topics: DTIC Archive, Mote, Jimmy D, MARTIN MARIETTA AEROSPACE DENVER CO, *GUN BARRELS, STRESSES,...

The dependence of the stress field on a continuous periodically varying stiffness which approximates a layered material is studied. This dependence is compared to the solution for the usual approximation of converting this class of problems to the superposition of an anisotropic one and a residual boundary problem. The region of applicability of the usual approximation is found to be as expected geometrically but surprisingly large as far as variation of stiffness is concerned.

Topics: DTIC Archive, Paslay, Paul R, BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING, *ROCK, BOUNDARY VALUE...

Topics: DTIC Archive, Ng, N H, EMMANUEL COLL BOSTON MA RESEARCH LANGUAGE CENTER, *DEFORMATION, *ELASTIC...

The ability of a single acoustic element to produce a compact time domain signal from a multi-mode solid cylindrical waveguide using a time-reversal mirror (TRM) is considered. Two single element longitudinal contact transducers were used to excite and receive multiple longitudinal modes in a fused quartz waveguide in a TRM experiment. The TRM is demonstrated to be effective with the limited information from a single longitudinal transducer. Experimental results are presented along with a...

Topics: DTIC Archive, Peterson, Michael L, MAINE UNIV AT ORONO, *ANISOTROPY, HIGH TEMPERATURE, ELASTIC...

In some circumstances, elastic-plastic deformation occurs in which both components of strain are finite. Such situations fall outside the scope of classical plasticity theory which assumes either infinitesimal strains or plastic-rigid theory for large strains. The present theory modifies the kinematics to include finite elastic and plastic strain components. For situations requiring this generalization, dilatational influences are usually significant including thermo-mechanical coupling. This...

Topics: DTIC Archive, Lee, E H, STANFORD UNIV CA DEPT OF APPLIED MECHANICS, *PLASTIC PROPERTIES, COLD...

This document presents and discusses the design and development of gas lubricated foil journal and thrust bearings for the specific application in a 1000 to 3000 pound thrust propulsion engine. The design activity included the development of analytical tools for the thrust and journal bearings and their use during the bearing test phase, for the purpose of increasing bearing load capacity. A significant effort was spent toward materials and coating development for capabilities to 1200 F.

Topics: DTIC Archive, Koepsel, Warren F., AIRESEARCH MFG CO OF ARIZONA PHOENIX, *GAS BEARINGS, *JOURNAL...

Topics: DTIC Archive, Southgate, P D, IIT RESEARCH INST CHICAGO IL, *SILICON, *INTERNAL FRICTION,...

Large crystalline molecular shells buckle spontaneously into icosahedra while multicomponent shells buckle into various polyhedra. Continuum elastic theory explains the buckling of closed shells with one elastic component into icosahedra. A generalized elastic model, on the other hand, describes the spontaneous buckling of inhomogeneous shells into regular and irregular polyhedra. By co-assembling water-insoluble anionic (1) amphiphiles with cationic (3 ) amphiphiles, we realized ionic...

Topics: DTIC Archive, Olvera de la Cruz,Monica, Northwestern University Evanston United States, materials...

The objective of this project was to develop a simple MCNPX model of the human eye to approximate dose delivered from proton therapy. The calculated dose included that due to proton interactions and secondary interactions, which included multiple coulombic energy scattering, elastic and inelastic scattering, and non-elastic nuclear reactions (i.e., the production of secondary particles). After benchmarking MCNPX with a known proton simulation, the proton therapy beam used at Laboratori...

Topics: DTIC Archive, Oertli, David B, TEXAS A AND M UNIV COLLEGE STATION, *COMPUTER PROGRAMMING, *ELASTIC...

The problem of reconstructing the density and elastic properties of a slab of infinite horizontal extent and finite thickness set in motion by a double couple excitation is considered. It is shown that the information contained in the amplitude and frequency response associated with a single horizontal wave number is sufficient to insure the uniqueness of the solution of this inverse problem. (Author)

Topics: DTIC Archive, Barcilon,Victor, CHICAGO UNIV ILL DEPT OF GEOPHYSICAL SCIENCES, *PROBLEM SOLVING,...